ORANGE-TIP WOOD- WHITE. 69 



(common cuckoo-flower) is the one on which the eggs 

 are most frequently deposited, but the greater part of 

 the larvce must perish in this neighbourhood, because 

 the fields are mowed before the larvae are full-grown. 

 I have very often seen the larvse on the seed-pods of 

 Erysimum Alliaria, and have several times found the 

 pupae on the dead stems of this plant in winter ; I 

 think that it is the principal food of Cardamines at 

 Epping ; it also probably feeds on E. barbarea, and 

 other similar plants. Some years ago we used to have 

 a quantity of a large single rocket in the garden, and 

 there was always a number of the larvse of Cardamines 

 feeding on the seed-pods. Cardamine impatiens is so 

 local a plant that it cannot be the common food of the 

 larvce of Cardamines." 



The chrysalis is of the very singular shape shown at 

 fig. 17, Plate I., a shape quite unique among British 

 butterflies, though :hat of the next slightly approaches 

 it. It is to be looked for in autumn and winter on the 

 dry, dead stems of the plants named in the foregoing 

 paragraph. 



The perfect butterfly, which is very common through- 

 out the country, is met with from the end of April to 

 the end of May or beginning of June. 



THE WOOD-WHITE BUTTERFLY. 

 (Leucophasia Sinapis.) (Plate V. fig. 2.) 



A GLANCE at the figure of this graceful little butterfly 

 (on Plate Y.) will suffice to distinguish it at once, and 

 clearly, from all our other WTiites. The most ordinary 

 form of the insect is there represented, but there are 

 specimens occasionally met with that have the blackish 

 spot at the tip of the wings very much fainter ; and 

 sometimes, as in one that I possess, this spot is totally 

 wanting. The shape of the wings in these is also dif- 

 ferent, being much rounder, and proportionately shorter, 



